1 /* 2 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /** 25 * @test TestTenuredGenPoolCollectionUsage 26 * @bug 8175375 27 * @requires vm.gc.G1 28 * @summary Verify that MemoryPoolMXBean.getCollectionUsage() works fine with 29 * -XX:+UseG1GC and -XX:+ExplicitGCInvokesConcurrent 30 * @library /test/lib / 31 * @modules java.base/jdk.internal.misc 32 * @modules java.management/sun.management 33 * @run main/othervm -XX:+ExplicitGCInvokesConcurrent -XX:+UseG1GC 34 * TestTenuredGenPoolCollectionUsage 35 */ 36 37 import java.util.ArrayList; 38 import java.util.List; 39 import java.lang.management.ManagementFactory; 40 import java.lang.management.MemoryPoolMXBean; 41 import java.lang.management.MemoryType; 42 import jdk.test.lib.Asserts; 43 44 public class TestTenuredGenPoolCollectionUsage { 45 46 public static void main(String[] args) { 47 new TestTenuredGenPoolCollectionUsage().test(); 48 } 49 50 private final void test() { 51 MemoryPoolMXBean tenuredGenPool = null; 52 List<byte[]> data = new ArrayList<>(); 53 for (MemoryPoolMXBean pool : ManagementFactory.getMemoryPoolMXBeans()) { 54 if (pool.getType() == MemoryType.HEAP && pool.isUsageThresholdSupported()) { 55 tenuredGenPool = pool; 56 } 57 } 58 data.add(new byte[1024 * 1024 * 50]); 59 try { 60 Thread.sleep(100); 61 } catch(InterruptedException ie) { 62 ie.printStackTrace(); 63 } 64 System.gc(); 65 System.out.println("Collection usage = " + tenuredGenPool.getCollectionUsage().getUsed() + ", usage = " + tenuredGenPool.getUsage().getUsed()); 66 Asserts.assertTrue(tenuredGenPool.getCollectionUsage().getUsed() > 0); 67 } 68 }